Word of Naughty Dog!
The new trailer released today about The Last of Us, was stunned by the extreme attention to detail and overall quality extremely high.
The first thing we thought was in editorial staff is that in computer graphics. For the avoidance of doubt, I personally contacted Eric Monacelli, community manager of Naughty Dog, saying on twitter that "the new cinematic trailer is very nice. I think is CG performed in-engine, the details are too high for real-time on the PS3. "
The answer is rather: "is all in-game footage!"